Maternal hypoxia and caffeine exposure depress fetal cardiovascular function during primary organogenesis
Journal of Obstetrics and Gynaecology Research, 05/31/2012
Momoi N et al. – Results suggest an additive negative effect of maternal caffeine on the fetal CV response to acute maternal hypoxia, potentially mediated via adenosine A2A receptor inhibition during primary cardiovascular morphogenesis.Methods
- Gestational–day–11.5 pregnant were exposed to hypoxia (45 s duration followed by 10 min of recovery and repeated 3 times) while simultaneously monitoring maternal and fetal CO using high–resolution echocardiography.
- Following maternal hypoxia exposure, maternal CO transiently decreased and then returned to pre–hypoxia baseline values.
- In contrast to a uniform maternal cardiac response to each exposure to hypoxia, the fetal CO recovery time to the baseline decreased, and CO rebounded above baseline following the second and third episodes of maternal hypoxia.
- Maternal caffeine treatment inhibited the fetal CO recovery to maternal hypoxia by lengthening the time to CO recovery and eliminating the CO rebound post–recovery.
- Selective treatment with an adenosine A2A receptor antagonist, but not an adenosine A1 receptor antagonist, reproduced the altered fetal CO response to maternal hypoxia created by caffeine exposure.